planner

### Constructing an Arc from Part of a Scan

You can construct a circle from a segment of a Linear Open, Linear Close, or Basic Circle scan. Planner creates an arc from part of the scan. The details of the construction are included further in this discussion.

To construct a scan segment circle:

1. Access the Construct Circle dialog box (Insert | Feature | Constructed | Circle).

2. Select the Scan Segment option.

3. Select a previously created Linear Open, Linear Close, or Basic Circle scan.

4. Click the Segment Data button. The Scan Segment dialog box will appear.

Scan Segment dialog box

5. Select either the Best Fit or BF Recomp option.

6. Select the portion of the scan used in the construction from this dialog box.

7. Type the number of points to potentially discard by entering values in the Discard Start and Discard End Maximum boxes.

8. Type a distance from the best fit circle into the Discard Tolerance box. This tolerance is a form tolerance; it allows you to control what end points are accepted as part of the arc. If the distance from the scan point to the best fit arc is greater than this tolerance value, then the end point will be discarded.

9. Input the Approximate Start and End Points of the scan by marking the Select Points check box, and then clicking in the Graphic Display window to fill in the X, Y, and Z fields. You can click anywhere in the Graphic Display window, however, Planner will place the point on the scan nearest to where you clicked. You can also edit the point values by using the keyboard.

10. Click OK to accept the data and close the Scan Segment dialog box.

11. Click Create to construct the arc from the scan.

If you want more than one arc or line from a given scan, then you will need to add another command for a different section of the scan.